Composite superheater



Dec. 12, 1933. c. w. GORDON COMPOSITE SUPERHEATER Filed April 9, 1932 INVENT R ChadeS .Gord q Q ATTORNEY 'Q C) Q) Patented Dec. 12, 1933 UNITED STATES r 1,938,695 r I COMPOSITE SUP RHEATER Charles W. Gordon, Munster, Ind., assignor to The superheater Company, New York, N. Y.

' Application April 9, 1932. Serial No. 664,241

Claims.

My invention relates to superheater boilers and more particularly to arrangements with boilers for. promoting the use of radiant superheating surface. V

5 It is often desired that a superheater boiler deliver steam of high temperature. If, however, all the superheating surface is of the convection type, this may necessitate .a very large super heater, while the ordinary radiant type superheater is expensive to install and to maintain.

Further, a superheater installation having a portion of its heating surface heated by convection and a portion heated by radiation ordinarily requires double the expense for headers as compared with one of either the radiant heated or convection heated type throughout.

It is the principal object of 'my invention to provide an arrangement adapted to avoid the above mentioned difficulties.

The novel features of my invention are pointed out in the appended claims. In order, however, that my invention, together with its objects and advantages, may be more fully and readily understood, I will now describe in detail and in connection with the accompanying drawing a superheater boiler installation in accordance with my invention and selected by way of example from a number of possible embodiments thereof. In

the drawing, t

Fig. 1 is a vertical sectional view of a superheater boiler in accordance with my invention. Fig. 2 is a fragmentary sectional view on the line 2-2 of Fig.1, looking in the direction of the .arrows.

Fig. 3 is a view similar to Fig. 2, but showing a different arrangement of the superheater units.

The installation illustrated in Figs. 1 and 2 'comprises a Stirling type boiler having upper steam and water drums 12 and 14 and a lower ..water or mud drum 16 connected by a front tube bank 18 and a rear tube bank 20 in the usual manner. The tubes of bank 18 are inclined somewhat to the vertical so as to receive some radiant heat from the furnace chamber 22 which lies below and in front of the bank 18 while their considerable vertical extent creates a high hydrostatic head to cause circulation thru the tubes clue to temperature differences in the front and rear banks. As is clearly shown in Fig. 2, the tubes 24, 24 of the bank 18 are arranged in rows parallel to the front of the bank and also in rows in the direction from front to rear of the bank so as to provide clear lanes 26 between such second mentioned rows for the reception of superheater units which are shown at 28, 28 and 29,

increasing the amount of radiant heat absorbed 5 In accordance with my invention, at least some of the superheater surface is supported from the front. row of tubes 24 in bank 18 so that such surface receives a high degree of radiant heat tO- gether with considerable convection heat. In the arrangement illustrated in Figs- 1 and 2, each water tube 24 in the front row of bank 18 has a lug 3,0 fixedthereto, preferablyby welding. The

superheater comprises a header32 for saturated steam from which steam is taken thru tubes 34, 34 for a group of units which are to receive radiant heat. Tubes 34 run downwardly parallel to the front row of tubes 24 and close to but somewhat in front of such water tubes. have fixed thereto lugs 36 which are adapted to be connected to the lugs 30 on water tubes 24 to hold tubes 34 in position. While the lugs 36 secured to the rear face of tubes 34 and 40 and the lugs 30 secured to the front face of tubes 24 35 have been found to be a convenient means of supporting tubes 34 and 40, I do not limit myself to such means. Preferably, lugs 30 and 36 are placed every four feet along the length of tubes 24 over the portion of such tubes having tubes 34 no parallel thereto. In the arrangement shown in Figs. 1 and 2, moreover, the tubes 34 connect at their lower ends by return bends 38 with tubes 40, 40 which also run parallel to the front row of tubes 24'and have lugs 36 thereon by which they may be connected to lugs 30 and thereby supported from the tubes 24. It is obvious that the tubes 34 or the tubes 34 and 40 may be used singly or in pairs as superheater units largely of the radiant type, but I prefer to combine such tubes with others in superheater units more nearly of the convection type and for this purpose I have illustrated in Fig. 1 a return bend 41 at the upper end of each tube 40 arranged to connect such tube 40 with one or more superheater tubes 42, 42 lying within one of thelanes 26 and back of the front row of tubes 24. As shown in Figs. 1 and 2, there are two such tubes 42 in each front unit 29. For connecting two tubes 42 in a given unit 29, I have illustrated a return bend Tubes 34 also so 44 at the lower ends of such tubes, the rear tube 42 of each unit 29 being extended upward and connected with the header 46 for superheated steam thru the extension 43. In Figs. 1 and 2, I have illustrated further, additional units 28 wholly of the convection type and each connected by tubular connections 28a and 28b with headers 32 and 46 respectively. 7

In Fig. 3 there are also two sets of units shown, the rear one of which is composed of units 28a, 28a of the convection type and a set of front units 29a, 29a composed of units receiving a considerable amount of radiant heat. However, whereas units 29 of Figs. 1 and 2 have two tubes in front of the front row of boiler tubes 24, the elements 29a of Fig. 3 each have only one tube in front of the front row of boiler'tubes. The arrangement of Fig. 3, therefore, produces a superheater having a characteristic more of the convection type whereas the arrangement of Figs. 1 and 2 produces a superheater having an almost flat load-temperature curve- Since the arrangement of Fig. 3 has only half the number of tubes in front of the tube bank compared with Fig. 2, the lugs 30 may be omitted from every other tube 24 of the front bank and the front tubes 34 of two units 29a suspended on a single tube 24. However, I do not limit myself to this.

It will be seen, moreover, that the tubes 34 and I and the superheater which lie in front of the front row of tubes 24 are offset somewhat from the centre lines of the lanes 26 so as to overlap the tubes 24. Tubes 34 and 40 therefore are in a position to radiate effectively to the front row of boiler tubes 24 whenever the tubes 34 and 40 are in danger of becoming overheated.

What Iclaim is:

1. The combination of a vertically inclined bank of boiler tubes arranged in rows to provide lanes therebetween, a superheater having units,

portions of which lie within said lanes and pertions of which lie in front of the front row of said bank and off-set from said lanes, and means for supporting said front portions of said elements in position to radiate effectively to the tubes in the front row of said bank.

2. The combination as set forth in claim 1 and in which the superheater has two tubes in a given unit parallel to and suspended from a given boiler tube of the front row of the boiler.

3. The combination of a bank of semi-vertical 1 generating tubes having lanes therein extending transverse to the face of the bank exposed to the furnace, forwardly projecting lugs fixed to the front faces of the tubes in the front row of said bank, a. superheater having certain units ar-' ranged principally in said lanes and having certain tubes off-set from said lanes in front of said front row, and means for connecting said front superheater tubes to one of said lugs in position to radiateeffectively to the tubes of .said front row.

4. The combinationas set forth in claim 1 and in which the superheater has one tube of two separate units suspended from a given tube in the front row of boiler tubes 5. The combination of a vertically inclined bank of boiler tubes arranged in rows to provide lanes therebetween, upper and lower drums connected to said tubes, a superheater having units, said units having portions thereof insaid lanes and portions in front of the front row of said bank and ofi-set from said lanes, means for supportingsaid front portions of said elements in position to radiate effectively to the tubes of the front row of said bank, and headers for said units, the portions of said units leading from said bank to said headers passing in front of said upper drum.

CHARLES W. GORDON.

LOO 

